Even at 21, Rossini knew how to light up an opera audience—in the Overture to Il signor Bruschino, he had them laughing before the curtain went up, thanks to some well-timed taps on the violinists’ music stands. Haydn was a dazzling entertainer himself, as heard in the witty “night music” he adapted for London’s adoring crowds. Mozart, in a time of debt and desperation, forged his most intense symphony, No. 40 in G minor. Norway’s Tine Thing Helseth brings illuminating adaptations of concertos by Bach and Albinoni. Two of the most heavenly slow movements ever written accentuate the voice-like intimacy of Helseth’s trumpet interpretations.